Tire cutter



July 7, 1925.

F. H. GROVE TIRE CUTTER 2=Sheets-Sheet 1 Filed March 15 J grwan roz limit/7 6/009 flflio'zwew F. H. GROVE July 7, 192-5.

TIRE CUTTER File a h 15. 1922 2 Sheets$heet 2 re 7 we 7 rennin! n. onovnor conumamnn, 01110,

mun CUTTER.

Application filed March 13,1922. Serial No. 543,448.

To all, whom it may comer n:

Be it known that I, FRANK H. Gnovn, a. citizen of the United States, residing at Go lumbisne, in thecounty of Golumbiane and particularly to a, machine forcutting sample sections from tire casings. It is customary for automobile manufacturers to provide a great number of sample sections of tiresto their sales organization "and the numerous departments of the foctory,-these sample sections. being usually produced by cutting the some from, stock tires.

To fulfill the purpose for which they are required, it is necessary that these sample sections be cut cleanly and accurately, and

as great numbers of these sections are required in the normal operation of the tire manufacturing business, it is wsentiul that accurate samples be produced with a, minimum of time and expense,

The objects of, the present invention are toprovide a. machine which will quickly and Y accurately cut sample sections from tires of various sizes.

The above and other objects may be at teined by providing a, construction such as illustrated 1n the accompanying draw ngs, 1n vvhrch- I fl igure 1 1s a vertical, sectional view through {L'tilfl cutter embodying theiinvention; Fig. 2, an end elevation of thesame; and Fig 3, an enlarged sectionelview of-the mandrel. v 7.

Similar numerals refer to. similar parts throughout the dmwi s. 1

A housing is indicate atrl adapted to contain-e-motor 2 upon the shaft ofwhich is mounted, a pinion 3 meshing withzthe gear 4 normally loosclymou'nteduponthe drive shaft 5 end arranged to be fixedl ,connected thereto through the-clutch 6 w 'ich is opereted through the lever 7, link 8 and pedelh The shaft 15 is journaledin bearings 10 formed in. the housing 1 andcerries the drive'pinion lint-its forward end. A large ,thehous'ing 1. Y r l The journal 130i this gear contains a, congeor12 meshes with thevdrive pinion 11 end is provided with the 101111131 portion 13 V journaled within the bearing 14 formed in lid For the pur centric bearing 15 for the shoft 16 having in" Its rear end a pinion 17 operatively connect- 7 ed through a chain of gearing 18 with the our 19 carried upon the shaft 20, which ism ournaled in the bearing 21 supported above the housing 1. A hand Wheel 22 is fixed upon the forward end of the shaft in a; position to be grasped by the operator. 1

The forward end of the'shaft 16 CHIIIBSI- the bevel pinion 23 which meshes with the bevel gears 24 carried upon the inner extremities of the diametrically opposed screws 25; ,The screws 25 are rovided with the journal. portions 26 and 2? bearings 28'and 29 respectively, formed in a guide block 30 which is mounted-upon the forward face of the can 12. v A pair-of slidnblei 32 upon each ofsa-id blocks receiving a nut 33 upon the adjucentscrew 25. Each of the blocks 31' is provided with e spindle 34 upon which is loosely mounted-u, cutting disk 35.

.A mandrel 36 is concentrically mounted upon the guide block 30und rovided with the reduced shank 37edupte to receive e collar 38 which may be varied in size to ac commodete various sizes of tires.

to be cut is mounted upon a bracket 40 car- 'ried bythe housing 1, enderritnged tobe adjusted vertically for cutting tires of differ ent sizes by means of the screw 41 and hand wheel 42.

in'the. form of a, screw 43 arranged to conlocks 31 are mounted in the guide block 30, a'bifurcated portion 7 I journeled in Q A work table 39 which supports thetire I A limit stop is provided for limiting the inward movement of the "blocks 31 which A, carrythc disk cutters and. this ispreferebly tact with the annular shoulder 44 of-the guide block. For the urpose'of locking this screw in the desire position, a locking late .45 is mounted within a) recess in the lock and arranged to he forced against the screw by the conical end 46 ofthe locking upon the man rel durin'gthe cuttin tion, a. clamping device 1s provided w hich ma compress guws 48 pivoted intermediate r'.

their extremities as nit-49. u on a, suitable bracket 50, each of said jaws 'emg ro-vided with a tooth 51 for engagement wit 1 the tire casing. The tail portions 52,01? the jaws are connectcd'by afpai'r-of toggle levers 5,3, the i pivot pin 54 0 said toggle being s'lidebly mounted in a, slot 55 formed in the bracket use of holding the tire rigid operar were 50, a hell crank lever is connected to the toggle levers by a link 57 and provided with an operating handle 58. 3

For the purpose of gauging the size of the sample-section to be out from the two, a rod is longitudinally adjustable through bore 01 in the collar 38 and is provided upon or removed from the mandrel and when in position thereon is held against accidental displacement and the mandrel may freely rotate within the collar which is held against rotation bythe the.

In operating the machine to cut sample sections from a tire casing, the table 39 is adjusted vertically to accommodate the sizeof: casing to be cut, andthe proper size colin. 38 is placed upon the mandrel 36. The tire casing, whichof course must first be severed to receive the collar of the mandrel,

then placed upon the table, the open end thereof being placed over the collar of the mandrel.

The clamping jaws 48 are then operated by means of the lever 56, the teeth,5 1 engaging opposite. sides of the tire and holding it rigid upon the table. It is, of course, understood that the end of the tire casing is extended the desired distance over the mandrel to secure thesize of sample section required. The treadle 9 is then depressed, sliding the clutch G into engagement with the drive gear 4 and through the pinion 11,-.rotating the large gear 12 upon which the cutting disks 35 are carried. 1

The operator then grasps the hand wheel 53, holding the same against rotation, thus holding the pinion 23 against movement and causing the screws 25, through the bevel gear 2% to be rotated in adircction to draw the cutting disks 35 toward each other. As the cutting disks thus rotate around th tire casing, and move toward each other,

rate y cut-from the tire.

sample sections will he cleanly and; accuwith I I I claim 1. A tire cutter including a table arranged to support the tire to be cut, a guide block rotatably mounted adjacent to the table, a. pair of cutting disks slidably mounted upon the guide block, a mandrel concentrically mounted upon the guide block and adapted to be inserted into the open end of the tire, a collar rotatably mounted upon the'mandrel and arranged to engage the inner surface of the tire, a pair of screws for automatically moving the cutting disks toward each other as they are rotated, a normally rotating shaft operatively connected to the screws, and means for holding said shaft against rotation to operate the screws.

2. A tire cutter including a table ar-' ranged to support the tire to cut, a guide block rotatably mounted adjacent to the table, a pair of cutting disks slidabl mount ed upon the guide block, a mandre concentrically mounted upon the guide block and adapted to be inserted into the open end of the tire, a pair of screws for automatically moving the cutting disks toward each other as they are rotated, bevel gears upon said screws, a shaft having a bevel pinion meshing with said gears, and means for holding said shaft against rotation to operate the screws.

3. A the cutter including a table arranged to support the tire to be cut, a guide block rotatably mounted adjacent to the- I table, a pair of cutting disks slidahly ranged to support the tire to he cut, a guide block rotatably mounted adjacent to the table, a pair of -'cuttin disks slidably mounted upon the guide i1 concentrically mounted upon the guide block and adapted to be inserted into the open end of the tire, a pair of screws for auto matically moving the cutting'disks toward eck, a mandrel rotating shaft operatively connected tothe 1 screws and means for holding said shaft against rotation to operate the screws.

' FRANK H. GROVE.

each other as they are rotated, a normal 

